Describe Hypershift and reference some concepts

Add very brief description of Hypershift and reference where Management
and Hosted Clusters are described.

doc/usage.md

@@ -573,13 +573,14 @@ error result.
 
 ## How to Use Compliance Operator with HyperShift Management Cluster
 
-Compliance Operator is able to run a platform scan on the HyperShift Managment cluster
-for the Hosted Cluster with a tailoredProfile.
+[Hypershift](https://hypershift-docs.netlify.app/) allows one to create and manage clusters on existing infrastructure.
+Compliance Operator is able to create a platform scan on the [HyperShift Management Cluster](https://hypershift-docs.netlify.app/reference/concepts-and-personas/)
+for the Hosted Cluster with a TailoredProfile.
 
 Currently, we only support CIS profile and PCI-DSS profile,
 you can either extend `ocp4-cis` or `ocp4-pci-dss`.
 
-In order to scan a Hosted Cluster, you need to create a tailoredProfile to define the
+In order to scan a Hosted Cluster, you need to create a TailoredProfile to define the
 name and namespace of the Hosted cluster that you want to scan.
 Set the value of `ocp4-hypershift-cluster` to the name of the target Hosted Cluster,
 and set the value of `ocp4-hypershift-namespace-prefix` to the namespace where the
@@ -627,7 +628,7 @@ settingsRef:
 
 ## How to Use Compliance Operator with HyperShift Hosted Cluster
 
-Compliance Operator is able to run a platform scan on the HyperShift Hosted cluster
+Compliance Operator is able to run a platform scan on the [HyperShift Hosted Cluster](https://hypershift-docs.netlify.app/reference/concepts-and-personas/)
 without any tailoredProfile. Any unsupport rules will be hidden from the `ComplianceCheckResult`.
 
 However, you need to use a special subscription file to install Compliance Operator on the